Chem: Identifying Patterns

Why is identifying a reaction type important?

It helps predict products and design reactions.

What is the identifying feature of a combination reaction?

A single product.

What is the general formula for a combination reaction?

A + B → C

Give an example of a combination reaction.

Zinc (Zn) and sulfur (S) combine to form zinc sulfide (ZnS).

Give another example of a combination reaction.

Hydrogen (H₂) and oxygen (O₂) combine to form water (H₂O).

What is the identifying feature of a decomposition reaction?

One reactant.

What is the general formula for a decomposition reaction?

C → A + B

Give an example of a decomposition reaction.

Hydrogen peroxide (H₂O₂) decomposes into water (H₂O) and oxygen (O₂).

Give another example of a decomposition reaction.

Barium carbonate (BaCO₃) decomposes into barium oxide (BaO) and carbon dioxide (CO₂).

What is the identifying feature of a combustion reaction?

Oxygen as a reactant.

What is another name for combustion?

Fire.

Give an example of a combustion reaction.

Iron (Fe) burns in oxygen (O₂) at high temperatures to form iron oxide (Fe₂O₃).

Give another example of a combustion reaction.

Hydrogen gas (H₂) combusts in oxygen (O₂) to produce water (H₂O).

What are the products of a hydrocarbon combustion reaction?

Carbon dioxide (CO₂) and water (H₂O).

Name two types of hydrocarbons.

CxHy (e.g., methane, propane, octane) and CxHyOz (e.g., formaldehyde, glucose).

Give an example of a hydrocarbon.

Methane (CH₄).

Give another example of a hydrocarbon.

Ethane (C₂H₆).

Write the combustion reaction of methane.

CH₄ + 2O₂ → CO₂ + 2H₂O

What is the identifying feature of a single replacement reaction?

An element reacting with an ionic compound.

What is the general formula for a single replacement reaction?

A + BC → B + AC

Give an example of a single replacement reaction.

Aluminum (Al) reacts with zinc chloride (ZnCl₂) to produce zinc (Zn) and aluminum chloride (AlCl₃).

Write the equation for aluminum reacting with zinc chloride.

2Al + 3ZnCl₂ → 3Zn + 2AlCl₃

What is another name for a double replacement reaction?

Precipitate reaction.

What is the identifying feature of a double replacement reaction?

Two aqueous ionic compounds as reactants.

What is the general formula for a double replacement reaction?

AB + CD → AD + CB

Give an example of a double replacement reaction.

Aqueous magnesium sulfate (MgSO₄) reacts with aqueous zinc fluoride (ZnF₂) to form magnesium fluoride (MgF₂) and zinc sulfate (ZnSO₄).

Write the equation for magnesium sulfate reacting with zinc fluoride.

MgSO₄ + ZnF₂ → MgF₂ + ZnSO₄.